he submitted it to and went to great length to obfuscate it.
To add further light to this. One of his attempt at proving he really used a real cabinet, when it fact, he did not have access to one was showing a board swap video.
Donkey Kong and Donkey Kong Jr. run off similar hardware, so much in fact that you can swap out the main board from one game to the other and still play it, sure the cabinet won't match the game but everything else is legit. In fact back in the days, arcade owners could order conversion kits that was cheaper than buying a new arcade. It would be a new board with decals and inserts for your cabinet so you could turn an old less popular game into a newer game to draw in more of those quarters.
Also with cabinets aging and hardware failing there's been cabinet that have broken down with boards that are still intact so while it might be hard to fight a fully working cabinet of a old game like DK, finding a spare board is more likely. Especially considering some owners would have converted their DK cabinet into a DK J one long ago.
In this video Billy and his buddy at an arcade shoot themselves taking out the board of a DK Jr. cabinet and then swap in the fabled DK board that he allegedly recorded his score with.
They don't actually boot the arcade in the video, which would prove that it is now running Donkey Kong, and worse yet, while he whips the camera around when tech puts down the JR board and grabs the "DK" board, legions of anti-cheat autists have analyzed the video and due to the physical configuration of the chips on the board it's actually obvious he's just putting the DK JR board back in the cabinet.